Engine



FIG. 1 is a right side view of an engine according to the design;

FIG. 2 is a left side view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right, rear perspective view thereof; and,

FIG. 6 is a right, front perspective view thereof.

The broken lines in the drawings illustrate environmental subject matter only and form no part of the claimed design. The dash-dot-dash line defines the bounds of the claimed design and forms no part thereof. 

CLAIM The ornamental design for an engine, as shown and described. 